The BURKERT 20061791 Type 2920 is a manually operated 2/2-way angle seat valve designed to control the flow of media. It consists of a manual actuator made of high-quality PPS plastic and a 2-way body made of flow-optimized stainless steel. This specific model features a 3/4" G internal thread connection, a PTFE seat seal, and operates at pressures up to 25 bar (PN 25) and medium temperatures from -10 °C to 185 °C. The tried-and-tested self-adjusting packing gland guarantees optimal tightness and enables low-maintenance operation, even at high switching cycles.

It is suitable for shutting off both neutral and aggressive gaseous and liquid media, including steam, water, alcohols, oils, fuels, hydraulic fluids, salt solutions, alkalis, and organic solvents.

Structure and Description

Item	Description
1	Handwheel with locking (optional)
2	Position indicator
3	Relief bore
4	Wrench flat for open-end wrench
5	Angle seat body
6	Port connection
7	Flow direction indicator

General Technical Data

Product properties	Specification
Design	Angle seat valve on/off
Nominal diameter	DN 20 (3/4")
Flow direction	Flow to open (below seat)
Operating pressure	0 bar(g)...25 bar(g)
Nominal pressure	PN 25 (DIN EN 1333), Class 150 (DIN EN 1759)
Seat leakage	Leakage rate A (DIN EN 12266-1), seat seal PTFE, test medium air
Kv value (water)	11 m³/h
Operating medium	Steam, water, neutral gases, alcohols, oils, fuels, hydraulic fluids, salt solutions, alkalis, organic solvents
Medium temperature	-10 °C...+185 °C
Viscosity	Max. 600 mm²/s
Port connection	G (DIN ISO 228-1) Internal thread
Ambient temperature	-10 °C...+60 °C
Installation position	As required, preferably with actuator upright

Materials

No.	Element	Material
1	Cover	Polyamide (PA)
2	Screw	Stainless steel 1.4301
3	Lock pin	Stainless steel 1.4305
4	Handwheel	Polyphenylene sulfide (PPS)
5	Optical position indicator with scale	Polyamide (PA)
6	Packing gland	PTFE V-rings (filled), with spring compensation
7	Spindle	Stainless steel 1.4401 (316)/1.4404 (316L)
8	Spindle guide	PEEK
9	Body seal	Graphite
10	Swivel plate	Stainless steel 1.4401 (316)/1.4404 (316L)
11	Seat seal	PTFE
12	Valve body	Stainless steel 316L/CF3M

Product Design and Assembly

Position Indicator

When turning the handwheel anticlockwise, the reproducible stroke scale becomes visible between the position indicator and the handwheel. The scale on the handwheel determines the rotation position of the handwheel (50 positions). The reproducible stroke scale shows, depending on the bottom edge of the handwheel, the relative position of the valve (valve opening) and acts as a fixation point for determining the rotation position.

Flow Direction

The valve seat is always closed against the medium flow. The flow direction should therefore be set such that the valve reaches the flow beneath the valve seat.

Stroke Limitation (Optional)

Both the minimum and the maximum position of the valve can be adjusted via an adjustment sleeve. The handwheel can be removed for this purpose.

Interlock (Optional)

The valve can be secured against unintentional or unauthorized operation. For this purpose, a securing pin can be pressed down and turned. The locking pin has a hole (Ø 3.8) and can be secured with a padlock.

WARNING

The leakage class specified in the technical data cannot be guaranteed when the valve is locked in the closed position, depending on the operating and application conditions.

Installation and Maintenance

DANGER

Risk of injury due to high pressure and escaping medium Switch off the pressure before working on the device or system. Vent or drain the lines.

Notes for correct installation:

• Note the installation position. The device can be installed in any manner, preferably with the actuator facing upwards.
• Ensure pipelines are aligned before connection.
• Note the flow direction. The flow direction is visible on the valve body and on the type label.
• Clear impurities from pipelines (seal material, metal chips, etc.).

Inspection intervals:

• Perform a visual inspection of the device once per year.
• If leaks occur, replace the respective wearing part.
• Muddy and abrasive media require correspondingly shorter inspection intervals.